The position of the rook is shaky on h5.
13... f6g8  14. h3h4  14... g8e7  15. e2f3 A strange queen move, probably played to protect the rook on h1, something useful after h4-h5. 15... h8h5 This is a \"mysterious rook move,\" although I suspect not the type that inspired Nimzowitsch to write about this theme in his classical book \"My System.\" Harikrishna blocks the advance of the h-pawn, but White can still open the game on the queenside when Black may be left with a misplaced rook.